ath5k: warn and correct rate for unknown hw rate indexes

[pandora-kernel.git] / kernel / stop_machine.c

diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index 286c417..0cd415e 100644 (file)
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@@ -38,7 +38,10 @@ struct stop_machine_data {
 static unsigned int num_threads;
 static atomic_t thread_ack;
 static DEFINE_MUTEX(lock);
-
+/* setup_lock protects refcount, stop_machine_wq and stop_machine_work. */
+static DEFINE_MUTEX(setup_lock);
+/* Users of stop_machine. */
+static int refcount;
 static struct workqueue_struct *stop_machine_wq;
 static struct stop_machine_data active, idle;
 static const cpumask_t *active_cpus;
@@ -109,6 +112,43 @@ static int chill(void *unused)
        return 0;
 }
 
+int stop_machine_create(void)
+{
+       mutex_lock(&setup_lock);
+       if (refcount)
+               goto done;
+       stop_machine_wq = create_rt_workqueue("kstop");
+       if (!stop_machine_wq)
+               goto err_out;
+       stop_machine_work = alloc_percpu(struct work_struct);
+       if (!stop_machine_work)
+               goto err_out;
+done:
+       refcount++;
+       mutex_unlock(&setup_lock);
+       return 0;
+
+err_out:
+       if (stop_machine_wq)
+               destroy_workqueue(stop_machine_wq);
+       mutex_unlock(&setup_lock);
+       return -ENOMEM;
+}
+EXPORT_SYMBOL_GPL(stop_machine_create);
+
+void stop_machine_destroy(void)
+{
+       mutex_lock(&setup_lock);
+       refcount--;
+       if (refcount)
+               goto done;
+       destroy_workqueue(stop_machine_wq);
+       free_percpu(stop_machine_work);
+done:
+       mutex_unlock(&setup_lock);
+}
+EXPORT_SYMBOL_GPL(stop_machine_destroy);
+
 int __stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus)
 {
        struct work_struct *sm_work;
@@ -146,19 +186,14 @@ int stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus)
 {
        int ret;
 
+       ret = stop_machine_create();
+       if (ret)
+               return ret;
        /* No CPUs can come up or down during this. */
        get_online_cpus();
        ret = __stop_machine(fn, data, cpus);
        put_online_cpus();
-
+       stop_machine_destroy();
        return ret;
 }
 EXPORT_SYMBOL_GPL(stop_machine);
-
-static int __init stop_machine_init(void)
-{
-       stop_machine_wq = create_rt_workqueue("kstop");
-       stop_machine_work = alloc_percpu(struct work_struct);
-       return 0;
-}
-core_initcall(stop_machine_init);